Hydrogen bonds are found in all of the following EXCEPT
A. between phosphates in ATP.
B. in ?-helices.
C. between water molecules.
D. in the DNA double helix between nucleotides.
E. between the R groups of amino acids in proteins.
Answer: A
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Which of the following best describes the mechanism by which chromatin-remodeling complexes "loosen" the DNA wrapped around the core histones?
(a) They use energy derived from ATP hydrolysis to change the relative position of the DNA and the core histone octamer. (b) They chemically modify the DNA, changing the affinity between the histone octamer and the DNA. (c) They remove histone H1 from the linker DNA adjacent to the core histone octamer. (d) They chemically modify core histones to alter the affinity between the histone octamer and the DNA.
Most amphibians are completely dependent on an aquatic environment for ____.
A. respiration B. feeding C. reproduction D. movement E. thermoregulation
Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl2 different from the bond in KCl?
A. Cl2 is ionic and KCl is covalent. B. Cl2 is covalent and KCl is ionic. C. Cl2 and KCl are both ionic.
A florist assembles a bouquet of flowers from the following:
1. lilies, which have long leaves with parallel veins 2. Queen Anne's lace, also known as wild carrot because of its large taproot 3. buttercups, with their five lovely yellow petals 4. new shoots of daisies with two small cotyledons This bunch of flowers contains A) one eudicot and three monocots. B) two eudicots and two monocots. C) three eudicots and one monocot. D) all eudicots and no monocots.